Twin Viper

Twin Viper is a ranger-type weapon in the game Mobius Final Fantasy, offered during the multiplayer Final Fantasy VII Collaboration Event: Sephiroth Descends, running through February 2018.

It is obtainable from trades for various items in the Multiplayer area, Ring of Braves. While the weapon can only be obtained from Multiplayer, it appears to be usable in all areas.

Weapon Purchase
Twin Viper is purchasable from the Item Exchange, under the "Other" category. On first access only the base version is obtainable, but as each version is purchased, the next one replaces it in the Exchange.

Stats
Modifications needed for maxed Auto-Abilities and Stars: 16